Beam compass



May 22 1928.

H. A. JQNG BEAM coMPAss Filed Feb. 14, 1927 INVENTOR HARRY A. JUNG- & i gmmnxr Patented May 22, 1928.

\ j 1 I nanny 1A. mm, or ismonam'rou, NEW YORK."

BEAM courses.

Application filed February .14, i927. Serial no. 168,029.

My invent-ion relates generally to 0011ipasses and particularlyto that type known as. a beam compass which will permit the drawing of enlarged circles and arcs. The

principal object of my invention is to provide such a compass which is readily adjustable as to length and which; is frictionally held in its adjusted position.

Anotherbbject sto provide novel pencil and pointlor other instrument holding means, adjustable withrespect to the cornpass proper and which are frictionally held in their adjusted positions. Afstill further object is to provide such a compass which is readily extendable for working witlrlarge diameters and which is likewise easily collapsed for use with comparatively small diameters;

A still further objectis tolprovide' a coinpass of the 1 character described which is of few parts, easily andcheaply constructed and assembled. j V QMy improved compass is especially useful architectural drawing work as well as for carpenters and other draftsmen who Work with large diameters. v

Other ob'ects and advantages in details of constructionand operation will be ap- ,parent as the description proceeds,reference now beinghad to the figures of the drawing wherein like reference numerals indicate like parts. I

Figurelis a perspectiveview of my im provedcompassassembled and ready for use,

' the lengthof the compass being broken.

Figure 2 is a detail cross section taken on theline 2 -2 of Figure 1, e p I Figure detail end view of the comilhistiating. clearly the"frictional adjusting means of the instrument holder.

Figure 4 is a detail top plan view of a modified form of pencil holder.

Figure 5 is a side view thereof.

Figure 6 is a side View of the compass shown in Figure 1 illustrating a method of providing for an extra extension thereof.

Figure 7 is a view of a modified compass in its collapsed position.

The body of my improved compass comprises the two telescoping channel members 1 and 2, the latter fitting within the former and slidable therein to adjustthe length of the sections. Thesesections may be formed to provide a close frictional fit, one within the other, whereby they maybe extended or adjusted with respect to eachother readily but with. sufficient frictional resistance to retain the sections in adjusted positions.

The ends of the sections land 2 are open I andin the end of section lthere is slidably fitted, a supporting member 3, in this" in stance comprising a flat plate slidable with-- in thechann'el 4 of section 1, and provided centrally with a resilient tongue '5 prefer ably struck or formed from the material of the support 3. This resilient tongue 5 is adapted-to engage against the'wall' .6 of section '1 whereby to-iretain the support in its adjusted position within the section.

It will be noted that the wall of section 1 opposite the wall 6 is left open as at 7 The support3 is provided at its outer-end with an extension 8 extending at an angle thereto notched asat 9 to permitthe support 3 to be adjusted longitudinally of the section 1 without interference with the flanges 10 of the sectioni The free end of the portion 8 is preferably bent to form a resilient cylin dricalholder 11 within which is adapted to be frictionally held the point member 12 of the compass."

Thereis tlius'provided a novelholderfor the compass point, P811011, pen,or other in- 1 strument, which is of one piece construction and which may be readily adjusted within the section and frictionally retained in its adjusted; position. The provision of the resilient tongue 5 permits theoperator to press inwardly on the supporting plate 2-3 thus relieving the friction between suchplate and the overhanging walls 10 of the section whereupon the holder may be readily slid in) ,or' out with respect, to the section and upon release of the supporting plated, the tongue 5 will force the same back into engagement with the overhanging flanges 1t) thereby restoring the friction between the supporting plate 3 and such flanges to retain the holder in adjusted position.

The same construction as described in connection with the end of section 1 of the compass is provided for the end of section 2 and need not be repeated. The same reference characters refer to the same parts and the holders are identical inconstruotion and may be substituted one for the other. It is understood, of course, that in the holder at the end of section 2, a pencil 13 is provided notched angular portion 16, these parts be ing identical with th e parts 5 and 8 of the modification just dcscribc'd.- -In this form however; the free end of'the angular extension 1th instead of being bent upon itself to form a clip or resilient.cylinder: for receiving the pencil 17,-is left with a straight free edge over which is a'daptcd to be friction ally engaged the resilient sleeve 18, split throughout its length along one side, Whereby it may be .frictionally clamped to the free end of the angular-extension 16,thelpe ncil 17 in this case being clamped in. the lower end of the-sleeve 18. i l w In Figure 6, 1 have illustrated the compass sections 1 and 2 of the compass shown in Figure 1, prm ided with an additional section. 19 for providing greater length to the compass. i 111 Figure 7, I have illustrated a slightly ditl'ercnt arrangement of telescoping sections wherein a single outside: section '20 is provided and into either end of which is frictionally slid the inner sections 21 and 22 carrying at their outer ends the holders 11. a

From the foregoing, it will be clear that I have provided an unusually inexpensive beam compass which may be formed of stamped metal or other.suitablematerial and one which oli'ers a wide field of use due to the ready adjustaliility thereof. Of course, many changesmay be made-in details of construction and arrangement of parts without departing from the spirit and scope of my invention. .1 do not limit myself, therefore-to the exact form. shown other than by the appended claims.

I claim a 1. Al'OITLPflSS comprising a member composed oi telescoping sections frietionally adjustable one upon the otheryand removable instrument holders frictionally held in said sections.

2: 21 compass comprising a member composed of telescoping channel sections frictionally adjustable one upon the other, and removable instriiineht holders frictionally adjustable therein.

3/21 compass comprising a member composed of tel cscopingchannel sections frictionally adjustable "o'ne upon the other, and one piece removable instrument holdersadjustable therein. 7 i i i 4. A compass comprising a member composed of telescoping chann'el sections an tionally adjustable one upon the ot li er one piece removable instrument holders adjust;- able therein. and means on said holdcrs for frictionally holding an instri'imentl' i 5. A compass including a channel section,

an instrument holder therein comprising a plate slidable in said sectioinresilientineans on said plate for frietionallyholdingsaid plate in adjusted position, an extension 6a said plate extending at an angle tliretdand an instrumentholding member on s ai ,extension.

6. A compass includi ng a channel section, an instrument holder therein comprif'nga plate slidable in said channel;sect1on,"aresilient tongue struck from said 111K136- gagcahle with a wallet said section'for fric' tionally holding said plate in adjiistetl po sition, an extension on said )lateat an an 1e thereto, the free end of sai extension b'mg formed to frictionally receive an instrument. i

-7. A compass including a channel section,

an instrument holdei' therein comprising a plate slidable in said channel secnbrca s silient tongue struck from said plate anden gaging with a Wall of said section tor fric tionally holding said plate in adjusted 6st: tion. means for releasing said friction while adjusting said plate, an extension o'n" said plate angular thereto. said'extnsion b in notched to permit sliding moveriient thereof in said channel sectionyand thefi'e' erid 'of y 7 i. l i said section being bent u on ltselfto form a resilientinstrument hol ing ele m enti' HARRY A JUNE. 

